Red Bull's Sebastian Vettel edged out Fernando Alonso to set fastest time in the opening practice session for the Monaco Grand Prix. Nico Rosberg was third for Mercedes, half a second down, followed by Alonso's teammate Felipe Massa and the two McLarens of Lewis Hamilton and Jenson Button.

Last year's winner Mark Webber had a gearbox issue on his Red Bull meant he only completed three slow installation laps and did not set a time.

Pastor Maldonado surprised the paddock with a seventh for Williams.

Tonio Liuzzi crashed his Hispania on the approach to the chicane and Michael Schumacher locked up on the approach to Sainte Devote and spun sideways into the barriers.

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